I did MKE-PHL for about a month, not a big deal. Midwest had 3 or 4 flights a day and US had about 2. Then of course is the hour drive to ACY. The other option would be ORD-MYR-ACY on Spirit or ORD-ATL-ACY on Airtran. You will still need a car in ACY, the airport is in the middle of no where.